MySQL Articles - Page 71 of 439

It would be good to use IN() instead of multiple OR statements. Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> FirstName varchar(20)    -> ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable(FirstName) values('David'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 ... Read More

To implement custom sort order in MySQL, you need to use ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable    -> (    -> Designation varchar(100)    -> ); Query OK, 0 rows affected (1.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Software Engineer'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Associate Software Engineer'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('Software Development Engineer'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Product Manager'); Query OK, 1 row ... Read More

To subtract a day in MySQL, use the DATE_SUB() method. Let us first create a table −mysql> create table DemoTable    -> (    -> AdmissionDate timestamp    -> ); Query OK, 0 rows affected (1.05 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-01'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('2018-12-31'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2017-03-13'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('2019-01-02'); Query OK, 1 row affected (0.08 sec)Display all records from the table using select ... Read More

No, we cannot. To still work it out, use backticks around the field name. Let us first create a table with column name with asterisk, `Name*` −mysql> create table DemoTable    -> (    -> `Name*` varchar(20)    -> ); Query OK, 0 rows affected (2.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(`Name*`) values('Chris Brown'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(`Name*`) values('David Miller'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(`Name*`) values('John Doe'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(`Name*`) values('John Smith'); ... Read More

For this, you can use SOUND along with the LIKE operator. Let us first create a table −mysql> create table DemoTable    -> (    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.95 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values('Johm'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('Carol'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('SAMSUNG'); Query ... Read More

To replace a record that doesn’t exist, use the COALESCE in MySQL. The COALESCE would help in substituting the NULL values. Let us first create a table −mysql> create table DemoTable    -> (    -> Code varchar(20)    -> ); Query OK, 0 rows affected (1.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('45'); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values('78'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int,    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(201, 'Chris Brown'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(110, 'John Doe'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(101, 'Adam Smith'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(345, 'Carol Taylor'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(135, ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Value1 int,    -> Value2 int    -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(78, 89); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(19, null); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(null, 0); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(null, 95); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> ... Read More

For this, you can use CASE WHEN statement. Let us first create a table −mysql> create table DemoTable    -> (    -> FirstName varchar(20),    -> Score int -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 46); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('John', 78); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('John', 69); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris', 78); Query OK, 1 row affected (0.12 ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> FirstName varchar(20)    -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('David'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 ... Read More